Add Lua 5.1 to sample Debubuntu apt-get command (#7421)
Add Lua 5.1 to sample Debubuntu apt-get command (#7421)

To ensure it gets installed.

Cf. <https://github.com/koreader/koreader/issues/7409#issuecomment-800267291>.
Frenzie/koreader,Frenzie/koreader,NiLuJe/koreader,koreader/koreader,mwoz123/koreader,koreader/koreader,poire-z/koreader,NiLuJe/koreader,poire-z/koreader